Studies On The Interspecies Mutual Relationship Between The Three Species Of Economic Adaptation Animals In Paddy Field

The predation of Trionyx sinensis to juvenile Misgurnus anguillicaudatus ?Macrobrachium nipponensis and interspecific competition between juvenile Misgurnus anguillicaudatus and juvenile Macrobrachium nipponensis were studied, respectively,based on the predation effect and competition interaction for food, with Trionyx sinensis?Misgurnus anguillicaudatus and Macrobrachium nipponensis as the objects of study. The results show that:(1) The hunting time of T. sinensis [(416.67±14.21)g] concentrated in 00:00 to 4:00;However, The active interval of T. sinensis[(416.67±14.21)g] was from 18:00 to 06:00, and the hunting time focused on 00:00-04:00 a.m.(2) The type of predatory functional response of T. sinensis to M. anguillicaudatus is of Holling-? model, and the theoretical maximal preying quantity were 16.13 [Group A(37.53±7.72)mm] and 9.06 ind [Group B(63.13±12.95)mm]; The intraspecific interference and interspecific interference models could be expressed in exponential equations for each group case. These models or equations can be used to determine best economic practice and provide guidance for the maximum profit to favor turtle farmers.(2) When the stocking density of M. nipponensis was 30ind/m2, T. sinensis showed a stronger tendency to prey on B. When the stocking densities of M. nipponensis were 60ind/m2 and 90 ind/m2, T. sinensis showed a stronger tendency to prey on A; The predatory functional response of T. sinensis to M. nipponensis belonged to the type of Holling-?. The theoretical daily maximal preying quantity were 169 ind(A), 75ind(B) and 70ind(C),respectively.(3) During the geometric combinations, M. anguillicaudatus[(46.77±0.12)mm] can always arrive at foraging area, and both M. anguillicaudatus and M. nipponensis can reach a stable state of coexistence, but for nongeometric combination, With the increasing of the number of M. nipponensis [A(27.78±0.07)mm ? B(38.90±0.07)mm], M. nipponensis are easy to become a dominant group, but finally they can still reach a stable state of coexistence.